Banks Power Ford Trucks: (Diesel ’83 - 93 6.9 & 7.3L) Forced Induction — Sidewinder Turbo System (1st Generation) 6.9_7.3L Ford - Manual (Page 18)

OPERATING CHARACTERISTICS
s h o u l d e x h i b i t t h e Your B A N K S turbocharged diesel engine
following operating c h a r a c t e r i s t i c s :
Cruise Conditions ( C o n s t a n t 60 m p h on Level R o a d ) : EGT
should be approximately 4 0 0 d e g r e e s F; boost g a g e , if so
e q u i p p e d , should read 1 to 2 p o u n d s .
High Load Conditions ( U p h i l l with Heavy L o a d ) : EGT should
typically be 900 to 1000 d e g r e e s F, w i t h 1100 as a m a x i m u m ;
boost levels may approach 9 p o u n d s .
It is important to realize that d i e s e l s , unlike gasoline e n g i n e s ,
run cooler with additional a i r . It is impossible to run a diesel
too " l e a n " . Exhaust gas temperature rises as more fuel is a d d e d .
Turbocharging a diesel typically lowers the E G T . Normal cruise
condition EGT for a normally aspirated (non-turbocharged) diesel
engine is typically 600 to 650 d e g re e s F. As noted a b o v e , cruise
condition EGT for a turbocharged diesel is typically /i.OO degrees
F. This lower EGT translates directly to lower piston and valve
t e m p e r a t u r e s , and significantly increased engine life.
It is also important to understand that turbocharged boost
pressures are load r e l a t e d , that is the turbocharger makes boost
only when called upon to do so ( b y load r e q u i r e m e n t s ) . The turbo
will not " m a k e b o o s t " with the transmission in n e u t r a l , but makes
boost proportional to the l o a d . Long uphill g r a d e s , with a heavy
l o a d , will result in m a x i m u m b o o s t . In other w o r d s , the turbo
makes boost only when it is n e e d e d . This characteristic makes
turbochargers so attractive that the vast m a j o r i t y of long haul
trucks and off-road earth m o v i n g equipment are equipped with
turbochargers. Turbocharging typically results in more power and
t o r q u e , better fuel economy and increased engine l i f e .
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